Hi Kelly,
Is Babee eating and drinking normally? If your regular vet does not seem to know what to do, I suggest calling the ER doctor then. So long as she is eating and drinking, peeing, and it sounds like pooping. then she may not need to go back. If she isn't eating or drinking, then taking her back would be a good idea. Obviously the diarrhea needs attention. I would definitely ask for a bag of SubQ fluids, an admin. line and needles - and also buprenex for pain. The ER vet tech can show you how to administer both items. If it sounds a little overwhelming, you could post up your city and state and we could see if there is another member close by who can help teach you.
Regarding the food transition, it's not hard, but it will need to be handled very carefully and will take some time to do properly. Babee's digestive tract is very sensitive right now and may not be fully healed. I personally would wait until you and the vet are certain the pancreatitis attack has subsided and is under control before introducing a new food. When the attack is subsided and Babee is eating and drinking normally (and hopefully the metronidazole will keep the pooping under control) you might want to slowly start adding in a teaspoon of raw food to her regular food and mix it in. Some cats take to raw food right away like they were born to it, others like it and then stop liking it and others like it but get sick on it because it's so radically different for their bodies which are conditioned to eat commercial food. So long as she eats it and has no reactions (e.g vomiting, diarrhea, etc.) keep doing that for a week. The next week, add two teaspoons and start reducing her regular food accordingly, the following week add three teaspoons raw and reduce her regular food etc. until you are finally feeding all raw. It may take a month to fully transition her over.
While raw food did not work out for my Harley because he has constipation, not diarrhea, there are many kitties on the board whose diarrhea was controlled by raw food. If she doesn't like it or gets sick on it, return to feeding her the canned food she was eating that you know she likes. Sometimes a cat can be allergic to the protein source like chicken, turkey, fish, etc. so part of the food trial is to find out if she can tolerate the protein source. You might want to keep a food journal and document what you feed her and whether or not she had a reaction to it so that way you can try to narrow down what foods she may be sensitive to.
Sorry if this is overwhelming - this is like the Cliff Notes version of diet change and food trials.
HTH